Refactor and remove sqlite and replace with MySQL

internal/platform/config/config.go

@@ -0,0 +1,22 @@
+package config
+
+import (
+	"sync"
+
+	"synlotto-website/models"
+)
+
+var (
+	appConfig *models.Config
+	once      sync.Once
+)
+
+func Init(config *models.Config) {
+	once.Do(func() {
+		appConfig = config
+	})
+}
+
+func Get() *models.Config {
+	return appConfig
+}